2d896b816b
The Capsicum system calls modify file descriptor table entries. To ensure that readers observe a consistent snapshot of descriptor writes, the system calls need to signal to unlocked readers that an update is pending. Note that ioctl rights are always checked with the descriptor table lock held, so it is not strictly necessary to signal unlocked readers. However, we probably want to enable lockless ioctl checks eventually, so use seqc_write_begin() in kern_cap_ioctls_limit() too. Reviewed by: kib MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D24119
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